Stress Analysis And Structure Optimization Of The Top Of The Hydrogenation Reactor

The hydrogenation reactor is the core equipment in the oil refining industry, and it works under a high temperature, high pressure and near hydrogen condition. Therefore, in this paper the top of a big hydrogenation reactor was investigated. The steady-state temperature field and pseudo-steady-state temperature field of the hydrogenation reactor was analyzed through the ANSYS5.6 finite element software. Then the result of the temperature field was used to analyze the thermal stress and the mechanical stress. In this paper an optimization method program and a finite element software calling program were worked out in VC language, the optimal structure parameter of the linearly thickness changing segment was obtained by using the two programs together. A universal thermal stress calculation program was worked out in VC language including several components under special temperature field. In addition, according to the ASME, a program used to change the circumgyratetion-symmetrical structure into axis-symmetrical structure was worked out in VC language.The structure of the hydrogenation reactor was very complicated, and the working condition was changing ever and again. The temperature field especially the transient temperature field analysis was a difficult problem. Therefore, in order to decide the key-point of design the stress distribution must be analyzed roundly. In this paper the ANSYS5.6 finite element software was used to analyze the temperature field and calculate the thermal stress, and the stress distribution curve of the top of the hydrogenation reactor was educed. The danger zone of the structure was found through the stress intensity evaluation. The situation of different thickness connection was usually encountered in the pressure vessel design, and the linearly thickness-changing structure was often used. How to reduce the stress intensity became the aim of the optimization design. The optimization of the linearly thickness-changing segment was realized through program in this paper.In summary, the temperature field analysis, the stress analysis, the stress intensity evaluation and the optimization for top of the hydrogenation reactor have been carried out. All of these will provide consult to the high-pressure vessel design, and contribute to the greatness, complication, high parameter, severe working condition of the pressure vessel. In addition, the programs worked in this paper will provide convenient and efficient way to the design and calculation.